355 lines
11 KiB
Groff
355 lines
11 KiB
Groff
.\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $Id: ng_btsocket.4,v 1.7 2003/05/21 19:37:35 max Exp $
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.\" $FreeBSD$
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.\"
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.Dd November 13, 2012
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.Dt NG_BTSOCKET 4
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.Os
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.Sh NAME
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.Nm ng_btsocket
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.Nd Bluetooth sockets layer
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.Sh SYNOPSIS
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.In sys/types.h
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.In sys/socket.h
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.In sys/bitstring.h
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.In netgraph/bluetooth/include/ng_hci.h
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.In netgraph/bluetooth/include/ng_l2cap.h
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.In netgraph/bluetooth/include/ng_btsocket.h
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.Sh DESCRIPTION
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The
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.Nm
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module implements three Netgraph node types.
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Each type in its turn implements one protocol within
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.Dv PF_BLUETOOTH
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domain.
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.Sh Dv BLUETOOTH_PROTO_HCI Sh protocol
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.Ss Dv SOCK_RAW Ss HCI sockets
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Implemented by
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.Nm btsock_hci_raw
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Netgraph type.
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Raw HCI sockets allow sending of raw HCI command datagrams
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only to correspondents named in
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.Xr send 2
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calls.
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Raw HCI datagrams (HCI commands, events and data) are generally received with
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.Xr recvfrom 2 ,
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which returns the next datagram with its return address.
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Raw HCI sockets can also be used to control HCI nodes.
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.Pp
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The Bluetooth raw HCI socket address is defined as follows:
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.Bd -literal -offset indent
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/* Bluetooth version of struct sockaddr for raw HCI sockets */
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struct sockaddr_hci {
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u_char hci_len; /* total length */
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u_char hci_family; /* address family */
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char hci_node[32]; /* address (size == NG_NODESIZ ) */
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};
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.Ed
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.Pp
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Raw HCI sockets support a number of
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.Xr ioctl 2
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requests such as:
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.Bl -tag -width foo
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.It Dv SIOC_HCI_RAW_NODE_GET_STATE
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Returns current state for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_INIT
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Turn on
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.Dq inited
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bit for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_DEBUG
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Returns current debug level for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_SET_DEBUG
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Sets current debug level for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_BUFFER
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Returns current state of data buffers for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_BDADDR
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Returns BD_ADDR for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_FEATURES
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Returns the list of features supported by hardware for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_STAT
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Returns various statistic counters for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_RESET_STAT
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Resets all statistic counters for the HCI node to zero.
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.It Dv SIOC_HCI_RAW_NODE_FLUSH_NEIGHBOR_CACHE
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Remove all neighbor cache entries for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_NEIGHBOR_CACHE
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Returns content of the neighbor cache for the HCI node.
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.It Dv SIOC_HCI_RAW_NODE_GET_CON_LIST
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Returns list of active baseband connections (i.e., ACL and SCO links) for
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the HCI node.
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.It SIOC_HCI_RAW_NODE_GET_LINK_POLICY_MASK
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Returns current link policy settings mask for the HCI node.
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.It SIOC_HCI_RAW_NODE_SET_LINK_POLICY_MASK
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Sets current link policy settings mask for the HCI node.
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.It SIOC_HCI_RAW_NODE_GET_PACKET_MASK
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Returns current packet mask for the HCI node.
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.It SIOC_HCI_RAW_NODE_SET_PACKET_MASK
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Sets current packet mask for the HCI node.
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.It SIOC_HCI_RAW_NODE_GET_ROLE_SWITCH
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Returns current value of the role switch parameter for the HCI node.
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.It SIOC_HCI_RAW_NODE_SET_ROLE_SWITCH
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Sets new value of the role switch parameter for the HCI node.
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.El
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.Pp
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The
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.Va net.bluetooth.hci.sockets.raw.ioctl_timeout
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variable, that can be examined and set via
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.Xr sysctl 8 ,
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controls the control request timeout (in seconds) for raw HCI sockets.
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.Pp
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Raw HCI sockets support filters.
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The application can filter certain HCI datagram types.
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For HCI event datagrams the application can set additional filter.
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The raw HCI socket filter defined as follows:
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.Bd -literal -offset indent
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/*
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* Raw HCI socket filter.
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*
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* For packet mask use (1 << (HCI packet indicator - 1))
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* For event mask use (1 << (Event - 1))
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*/
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struct ng_btsocket_hci_raw_filter {
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bitstr_t bit_decl(packet_mask, 32);
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bitstr_t bit_decl(event_mask, (NG_HCI_EVENT_MASK_SIZE * 8));
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};
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.Ed
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.Pp
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The
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.Dv SO_HCI_RAW_FILTER
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option defined at
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.Dv SOL_HCI_RAW
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level can be used to obtain via
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.Xr getsockopt 2
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or change via
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.Xr setsockopt 2
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raw HCI socket's filter.
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.Sh Dv BLUETOOTH_PROTO_L2CAP Sh protocol
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The Bluetooth L2CAP socket address is defined as follows:
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.Bd -literal -offset indent
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/* Bluetooth version of struct sockaddr for L2CAP sockets */
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struct sockaddr_l2cap {
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u_char l2cap_len; /* total length */
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u_char l2cap_family; /* address family */
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uint16_t l2cap_psm; /* Protocol/Service Multiplexor */
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bdaddr_t l2cap_bdaddr; /* address */
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};
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.Ed
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.Ss Dv SOCK_RAW Ss L2CAP sockets
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Implemented by
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.Nm btsock_l2c_raw
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Netgraph type.
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Raw L2CAP sockets do not provide access to raw L2CAP datagrams.
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These
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sockets used to control L2CAP nodes and to issue special L2CAP requests
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such as
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.Dv ECHO_REQUEST
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and
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.Dv GET_INFO
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request.
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.Pp
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Raw L2CAP sockets support number of
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.Xr ioctl 2
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requests such as:
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.Bl -tag -width foo
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.It Dv SIOC_L2CAP_NODE_GET_FLAGS
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Returns current state for the L2CAP node.
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.It Dv SIOC_L2CAP_NODE_GET_DEBUG
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Returns current debug level for the L2CAP node.
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.It Dv SIOC_L2CAP_NODE_SET_DEBUG
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Sets current debug level for the L2CAP node.
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.It Dv SIOC_L2CAP_NODE_GET_CON_LIST
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Returns list of active baseband connections (i.e., ACL links) for the L2CAP
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node.
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.It Dv SIOC_L2CAP_NODE_GET_CHAN_LIST
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Returns list of active channels for the L2CAP node.
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.It Dv SIOC_L2CAP_NODE_GET_AUTO_DISCON_TIMO
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Returns current value of the auto disconnect timeout for the L2CAP node.
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.It Dv SIOC_L2CAP_NODE_SET_AUTO_DISCON_TIMO
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Sets current value of the auto disconnect timeout for the L2CAP node.
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.It Dv SIOC_L2CAP_L2CA_PING
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Issues L2CAP
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.Dv ECHO_REQUEST .
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.It Dv SIOC_L2CAP_L2CA_GET_INFO
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Issues L2CAP
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.Dv GET_INFO
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request.
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.El
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.Pp
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The
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.Va net.bluetooth.l2cap.sockets.raw.ioctl_timeout
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variable, that can be examined and set via
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.Xr sysctl 8 ,
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controls the control request timeout (in seconds) for raw L2CAP sockets.
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.Ss Dv SOCK_SEQPACKET Ss L2CAP sockets
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Implemented by
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.Nm btsock_l2c
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Netgraph type.
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L2CAP sockets are either
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.Dq active
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or
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.Dq passive .
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Active sockets initiate connections to passive sockets.
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By default, L2CAP sockets are created active; to create a passive socket, the
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.Xr listen 2
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system call must be used after binding the socket with the
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.Xr bind 2
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system call.
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Only passive sockets may use the
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.Xr accept 2
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call to accept incoming connections.
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Only active sockets may use the
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.Xr connect 2
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call to initiate connections.
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.Pp
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L2CAP sockets support
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.Dq "wildcard addressing" .
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In this case, socket must be bound to
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.Dv NG_HCI_BDADDR_ANY
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address.
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Note that PSM (Protocol/Service Multiplexor) field is always required.
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Once a connection has been established, the socket's address is
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fixed by the peer entity's location.
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The address assigned to the socket is
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the address associated with the Bluetooth device through which packets are
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being transmitted and received, and PSM (Protocol/Service Multiplexor).
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.Pp
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L2CAP sockets support number of options defined at
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.Dv SOL_L2CAP
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level which can be set with
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.Xr setsockopt 2
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and tested with
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.Xr getsockopt 2 :
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.Bl -tag -width foo
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.It Dv SO_L2CAP_IMTU
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Get (set) maximum payload size the local socket is capable of accepting.
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.It Dv SO_L2CAP_OMTU
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Get maximum payload size the remote socket is capable of accepting.
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.It Dv SO_L2CAP_IFLOW
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Get incoming flow specification for the socket.
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.Bf -emphasis
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Not implemented.
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.Ef
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.It Dv SO_L2CAP_OFLOW
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Get (set) outgoing flow specification for the socket.
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.Bf -emphasis
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Not implemented.
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.Ef
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.It Dv SO_L2CAP_FLUSH
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Get (set) value of the flush timeout.
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.Bf -emphasis
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Not implemented.
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.Ef
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.El
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.Sh Dv BLUETOOTH_PROTO_RFCOMM Sh protocol
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The Bluetooth RFCOMM socket address is defined as follows:
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.Bd -literal -offset indent
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/* Bluetooth version of struct sockaddr for RFCOMM sockets */
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struct sockaddr_rfcomm {
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u_char rfcomm_len; /* total length */
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u_char rfcomm_family; /* address family */
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bdaddr_t rfcomm_bdaddr; /* address */
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uint8_t rfcomm_channel; /* channel */
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};
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.Ed
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.Ss Dv SOCK_STREAM Ss RFCOMM sockets
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Note that RFCOMM sockets do not have associated Netgraph node type.
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RFCOMM sockets are implemented as additional layer on top of L2CAP sockets.
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RFCOMM sockets are either
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.Dq active
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or
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.Dq passive .
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Active sockets initiate connections to passive sockets.
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By default, RFCOMM sockets are created active; to create a passive socket, the
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.Xr listen 2
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system call must be used after binding the socket with the
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.Xr bind 2
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system call.
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Only passive sockets may use the
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.Xr accept 2
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call to accept incoming connections.
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Only active sockets may use the
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.Xr connect 2
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call to initiate connections.
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.Pp
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RFCOMM sockets support
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.Dq "wildcard addressing" .
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In this case, socket must be bound to
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.Dv NG_HCI_BDADDR_ANY
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address.
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Note that RFCOMM channel field is always required.
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Once a connection has been established, the socket's address is fixed by the
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peer entity's location.
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The address assigned to the socket is the address associated with the
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Bluetooth device through which packets are being transmitted and received,
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and RFCOMM channel.
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.Pp
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The following options, which can be tested with
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.Xr getsockopt 2
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call, are defined at
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.Dv SOL_RFCOMM
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level for RFCOMM sockets:
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.Bl -tag -width foo
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.It Dv SO_RFCOMM_MTU
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Returns the maximum transfer unit size (in bytes) for the underlying RFCOMM
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channel.
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Note that application still can write/read bigger chunks to/from the socket.
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.It Dv SO_RFCOMM_FC_INFO
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Return the flow control information for the underlying RFCOMM channel.
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.El
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.Pp
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The
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.Va net.bluetooth.rfcomm.sockets.stream.timeout
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variable, that can be examined and set via
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.Xr sysctl 8 ,
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controls the connection timeout (in seconds) for RFCOMM sockets.
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.Sh HOOKS
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These node types support hooks with arbitrary names (as long as they are
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unique) and always accept hook connection requests.
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.Sh NETGRAPH CONTROL MESSAGES
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These node types support the generic control messages.
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.Sh SHUTDOWN
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These nodes are persistent and cannot be shut down.
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.Sh SEE ALSO
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.Xr btsockstat 1 ,
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.Xr socket 2 ,
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.Xr netgraph 4 ,
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.Xr ng_bluetooth 4 ,
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.Xr ng_hci 4 ,
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.Xr ng_l2cap 4 ,
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.Xr ngctl 8 ,
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.Xr sysctl 8
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.Sh HISTORY
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The
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.Nm
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module was implemented in
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.Fx 5.0 .
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.Sh AUTHORS
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.An Maksim Yevmenkin Aq Mt m_evmenkin@yahoo.com
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.Sh BUGS
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Most likely.
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Please report if found.
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